Diagnosis
Your doctor can diagnose cutaneous mastocytosis by the appearance of your skin and confirm it by finding an abnormally high number of mast cells on a skin biopsy. The diagnosis of systemic mastocytosis is made when an increased number of abnormal mast cells is found during an examination of your bone marrow.
Other tests that are important in evaluating a suspected case of mastocytosis include measurement of a protein (tryptase) from mast cells in your blood and a search for specific genetic mutations that health experts associate with this disease.